Sillyventure 2013 XL invite

After the 1st invitro for Atari Jaguar by CHECKPOINT, here is another
one - SV2k13 invitro from polish demo team "LAMERS" for Atari XL/XE
machines ! Due to
the fact that the forthcoming SV is dedicated to 20th Atari Jaguar
anniversary, there's quite a lot of Jag accents in this release.